Well after a full hour of welding and 13 tig filler rods later, and about 30 min of checking for leaks, and breathing in too much smoke(burning oil) i shortened the sump by just under 30mm. the welding ended up looking like crap as i had to fill some ridiculous sized gaps with tig filler rods as i hadnt cut the steel sheet perfectly..... but at least no leaks.. Ive also shrotened the pick up pipe by 30mm
for a sump plug i welded in a m12 nut on the inside and ill just bolt an m12 bolt into there.
ive also made some secondary fixings for my mushrooms taping an m6 bolt into them which dinnt take long.